Power Distribution - Nokia Mobile Phones NSE-5 Series Service Manual

NSE–5
System Module
TX/RX SIGNALS
COBBA_GJP
LCD
vibra
motor
IR
roller
AUDIOLINES
BASEBAND

Power Distribution

In normal operation the baseband is powered from the phone's battery.
The battery consists of one Lithium–Ion cell. There is also a possibility to
use batteries consisting of three Nickel Metal Hydride cells or one Solid
state cell. An external charger can be used for recharging the battery and
supplying power to the phone. The charger can be either so called fast
charger, which can deliver supply current up to 1600 mA or a standard
charger that can deliver approx 300 mA.
The CCONT provides voltage to the circuitry excluding the RF PA, LCD
and IrDa which are supplied via a continuous power rail direct from the
battery. The RF PA module has a cutoff voltage of 3.1V. The battery (see
note) feeds power directly to several parts of the system: CCONT, PA and
UI circuitry (display lights, buzzer). The four dedicated control lines,
RxPwr, TxPwr, SIMCardPwr and SynthPwr from MAD2 to CCONT have
changed to a serial control signal between MAD2PR1 and CCONT.
Figure 8 shows a simplified block diagram of the power distribution.
Note : In battery terms there is VBATT and VB, the difference is a filter (coil and
capacitors)
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RF SUPPLIES
COBBA SUPPLY
CCONT
BB SUPPLY
core voltage
MAD2pr1
+
MEMORIES
SYSCON
Figure 7. Block Diagram
Technical Documentation
PA SUPPLY 13MHz
CLK
SIM
32kHz
CLK
SLEEP CLOCK
VBAT
CHAPS
PAMS
SYSTEM CLOCK
BATTERY
NiMH LiIon
Issue 1 07/99